不知道是否真想明白了这道题

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T-3-Q40.  
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

Which of the following ,if true, most helps to confirm the explanation above?

A.    Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges
B.    Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
C.    After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young
D.    Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
E.    The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
正确答案是B，选了A。
做完后回头想，发现关键是，没有看清楚题目在问什么，Which of the following ,if true, most helps to confirm the explanation above?是问以下哪个最能肯定这个解释，所以肯定是B了。欢迎大家拍啊